Continuous press for solid materials containing liquids



Oct. 3, 1933. P. A. H. VILLEZ CONTINUOUS PRESS FOR SOLID MATERIALS CONTAINING LIQUIDS Filed May 15, 1929 I? 1 E Q s Patented Oct. 3, 1933 uNiTED S A Poisonous-I'm.

anus oom'ammo LIQUIDS 1 laul. Alexandre Henri Villas, St Sa'uveur -De- Applieofionbhy 13, 1929, Serial No. 362.788, and

-V q inFranoeJune2,1928 1' Claim. ":(01. 100-48) I This invention relates to a continuous press for solid materials containing liquids toextract the greatest amount thereof to obtain materials" as dry as possible.

1 It is essentially characterized in that it 00na compressive. force previous to its entry intothe pressure'rollers so that its entry is such that no. I sliding of the rolierson the said material is pro-' duced.

" Fig; 1 shows. a curve of the compression exerted in'a solid material placed in a cylinder permeahle to the liquid-contained in the said'mm:

terial. m"

Fig. 2 showsdiagrammatically two compression cylinders. a

Fig. 3 shows the resultant forces on a point in Fig.1 acted on by;compression.,

4 shows the curve-of theforce resulting from the difference of the decompressive force 7 longer;

at restand the horizontal component of the reaction normal to the surface of the rollers, takins into consideration theco-eflicient of friction of the rollers on the material.

Fig. 5 is an elevation partly in section of the press.

Fig. 6 is a plan of the same partly in horizontal section.

The present invention is based on the putting 9 into practice of the following considerations.

If in a cylinder permeable to liquids a solid.

material impregnated with a liquid is compressed, the compressive forces will follow a perfectly determined law (which depends to a certain degree I on the speed of this compression) and which may be represented by the curve in Fig. 1. Thus for sible as shown in the curve Fig. 1 to determine for the section M, M the compressive force which Considering Fig. 2; two compressingrollers a mustbe exerted'on this sheet to obtain a reduction in volume from M1 M1? to lvLM Y If this force is designated by. E. it may be said to be the resultant of thetwo .forces R and C (Fig.3). x y m 1 R being the reactionnormal to the surface, of

therollersw v C being the thrust of compression. Owing to the rotation of the rollers these latter exert at the surface of the material "tobe come 5 pressed :1 drawing force p R, being the coefficient of frictlonof the metal of the roller on the material being treated. I

*Ihis force Rhas for a horizontal componen a-.force C which tends-to counterbalance the force C. If therefore it is desired that. the material shall not slip .from the action of the rollers i I a pressure equal to thediiference between force 7 The invention will be described with reference to the accompanying drawing.- I

G and force 0* must be. exerted onthe surface Ifthe forces'C C are studied it will be found thatirom' M1 to .Mzit varies as shown in the curve Fig. 4 md'there is a maximum at M.

.If therefore acompression. preferably greater then m; M1: is exerted on thematerial it will always be forced'under'the rollers and the matertal will be'drawn forward by these latter without possiblezslidin'g.

The maximum m: M; is smaller: 1 1. as the duration of compression (M1 M2) is 2. as the angle a for the point M is smaller. In other words rollers of large diameter must be used and given a very slow movement of rotation. I

The machine, the object of the present invention, is designed to fulfill the above conditions, being formed of two essential and distinct parts consisting respectively in two pressure rollers a and a stationary supporting shafts o, 0 and in a special press formed in three distinct parts as follows: a

The body of the press I) is formed in its rear end with a feed hopper c and at'its forward end with a tapered delivery d, e, d e which projects up to the nip of the pressure rollers and has the shape of this latter; Lastly, the continuity of the press allows the arresting disc hereafter described to prevent rotation of themat erial with 5 the screw f hereinafter described and thereby insure longitudinal advancing of the material.

Inside the body I) the screw 1, which is an 'Archimedean screw, is arranged having in section the form shown in Fig. 5 that is to say spirals of g circular section forwards and spirals of rectangular section rearwards. V I

The spirals of the front end of the'screw serve to house the sectors of the disc and those of the rear portion are arranged directly below the jection is engaged between the" forward spirals of the screw 1 thus forming a barrier.

The machine comprises two side members i and i suitably held together which carry at their forward end, two fixed shafts ;i i on which rotate v A It may be're'marked that owing to the prethe frame of the press b and the several-driving terial in which the liquid can collect to be reabsorbed by the solid material after pressing.

the two pressure rollers a, a and at the rear end shafts of the machine.

The drive is received by" a pulley It mounted on a shaft l. which is provided with a toothed wheel m. This latter gears with a toothed wheel n mounted on a shaftsq'and through it a wheel n keyed to a shaft -q l v On the two shafts q and q are keyed respectively two pinions r. r 'which gear withtoothed wheels s s mounted on the pressure rollers a a .v

The shaft q transmits itsmovement to .bevel wheels t which drive avshaft uwhich operates the pressing elements. I

On this shaft u is keyed a worm v gearing with a wheel w mounted ona shaft 2: operating the disco.

At'its end the shaft u carrlesa wheel 11 which drives an intermediate wheels which gears with awheel 2 keyed to the screw'f. 1

'The relation of the numberof. teeth on the bevel wheels tis foundby practice.

wardly by theArchimedean screw is changed and consequently the preliminarypcompression exerted'o'n the material to be treated;

It istherefore possible to approach as nearly f. The material discharged from the hopper c is moved forwardly by the spirals of the Archimedean screw 1 and somewhat compressed thereby, the arresting disc 9 preventing rotation of the material with the screw and hence greatly facilitating its advance and the material is fed between therollers a, a and progressively compressed thereby as will be apparent, the liquid being expressed from the material and discharged therefrom so that none of it returns to the compressed mass, and hence the drying of the compressed mass is greatly facilitated.

' At the exit from-the rollers the pressure is a 'maximum and may reach 2 to 300'kg per square centimetre.

liminary pressing there are no pockets in the ma- This feature of the machine allows for obtaining the maximum dryness of the solid material being' treated. a

While I have hereinshown and described a preferred form of my invention, I would have it understood that changes may be made in the form,v

ing element, at'ransporting'screw in the said element, a pair of rotating compressor rollers of relatively large diameter separated by a fixed inter- In'varying this relation, for a constant speed. of the rollers a,- a the volume of material fed-fort val,'andmounted in fixed bearings and between which the said transporting element isarranged to discharge; the said screw having a trough of larger size at the entry than at the exitof the. material for submitting it to a preliminary compression so as to render it homogeneous, and means'for setting into rotation the said" compressor rollers and the said transporting screw, the first at a speed less than the latter so that the threads of the transporting screw serve to effect'a preliminary compression of the material.

PAUL ALEXANDRE HENRI vnm'z. 

